code: def _(fermi_operator: FermiWord, ps=False, wire_map=None, tol=None):
      wires = list(fermi_operator.wires) or [0]
      identity_wire = wires[0]
  
      if len(fermi_operator) == 0:
          qubit_operator = PauliSentence({PauliWord({}): 1.0})
  
      else:
          coeffs = {"+": -0.5j, "-": 0.5j}
          qubit_operator = PauliSentence(
              {PauliWord({}): 1.0}
          )  # Identity PS to multiply PSs with
  
          for item in fermi_operator.items():
              (_, wire), sign = item
  
              z_string = dict(zip(range(wire), ["Z"] * wire))
              qubit_operator *= PauliSentence(
                  {
                      PauliWord({**z_string, **{wire: "X"}}): 0.5,
                      PauliWord({**z_string, **{wire: "Y"}}): coeffs[
                          sign
                      ],
                  }
              )
  
      for pw in qubit_operator:
          if (
              tol is not None
              and abs(qml.math.imag(qubit_operator[pw])) <= tol
          ):
              qubit_operator[pw] = qml.math.real(qubit_operator[pw])
  
      if not ps:
          # wire_order specifies wires to use for Identity (PauliWord({}))
          qubit_operator = qubit_operator.operation(
              wire_order=[identity_wire]
          )
  
      if wire_map:
          return qubit_operator.map_wires(wire_map)
  
      return qubit_operator
  
file_path: pennylane/pennylane/fermi/conversion.py
imports: from functools import singledispatch
  from typing import Union
  import pennylane
  from pennylane.operation import Operator
  from pennylane.pauli import PauliSentence, PauliWord
  from .fermionic import FermiSentence, FermiWord
label_desc: Use image node_id 3 for calling a global function with example usage: _(fermi_operator, ps, wire_map, tol) and returns: qubit_operator, qubit_operator